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| ©Xinhua Photo
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| Two babies with kidney stones receive medical treatment at a military hospital in Lanzhou, capital of northwest China's Gansu Province, Sept. 11, 2008
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Investigators believe dairy farmers added a dangerous chemical to milk that has been linked to kidney stones in infants and one death in China, state media said.
The government vowed "serious punishment" after China's biggest milk powder producer recalled 700 tons of baby formula. The official Xinhua News Agency said the powder was tainted with melamine, a chemical used in plastic.
The producer, Sanlu Group, knew about the contamination on August 6 but refrained from telling the public, according to a report on the Caijing business magazine website. Reports said Sanlu kept silent because some grocers refused to return tainted powder, but did not say why that prevented a public warning.